diff --git a/.functions/is_mac b/.functions/is_mac
index df38773..222f899 100755
--- a/.functions/is_mac
+++ b/.functions/is_mac
@@ -1,3 +1,3 @@
 is_mac() {
-  [ $(uname) == "Darwin" ]
+  [ "$(uname)" == "Darwin" ]
 }